This exercise has students use a simple physical model of the Earth, sun, and moon to understand why the moon changes phases from the perspective of Earthly observers. Students hold up balls representing the moon in a...

This activity, created by Beth Hufnagel and Bob Stein of Michigan State University, is useful for teachers who are discussing the the motion of the sun, moon and earth and how they all interact and cause daily motion, ...

This is a series of web pages on the Earth's Moon. It includes information about the Moon as observed by the eye from Earth, its orbital period, its phases, appearance and the reason it always presents one face, There is...